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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7666b69d75bdd84efd1e37042cb1a01e9118a3258577384f0fcb5f977f77ab' 
  AND token = 'vcz5Dy/4/un4S30nb34dGsF7ijrjCjau27e7zxmvxEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}